Wrench



Patented Oct. 2, 1934 WRENCH Oscar Lund, Briercrest, Saskatchewan, Canada Application February 20, 1933, Serial No. 657,634

In Canada February 25, 1932 2 Claims.

My invention relates to improvements in wrenches and, particularly, to that class of wrenches known as speed-wrenches, where the socket is hung on a universal joint.

Such wrenches now on the market have a common fault of not holding the socket stable in any definite position while adjusted to a nut, and, conseguently, they are hard to adjust to a nut, as the socket keeps falling out of adjustment under the influence of gravity, and my invention consists, principally, in providing means for holding the socket still in a desired position while adjusted to a nut, which is to be'tightened or loosened, thus saving time and annoyance.

I attain these objects by the mechanism illustrated in the accomanying drawing, in which Fig. 1 is a general view of the speed-wrench with an end view of the socket which is designated as Fig. 1A,

Fig. 2, details, in larger scale, of the socket and of part of the shank broken open to show a bore for plunger and spring,

Fig. 2A is an end view of socket shown in Fig. 2,

Fig. 3 is a fractional view seen from the same direction as in the previous figures, but with the socket bent over to one side,

Fig. 4 is a View of the socket and a fractional view of the shank, but rotated 90 degrees from the position in Fig. 2,

Fig. 4A is an end View of socket shown in Fig. 4,

Fig. 5 is a similar view to that in Fig. 4, but with the socket bent to one side of its universal joint, and

Fig 6 is a sectional view on section-line 6-6 in Fig. 4.

Similar letters refer to similar parts throughout the several views.

The form of the invention shown in the drawing is a preferred form, although it is understood that modifications in the forms and arrangement of the parts and the character of material used may be adopted without departing from the spirit of the invention as set forth in the appended claims, for it is evident that other methods of spring-action may be employed for controlling the movements of a socket hung on a universal joint, which is the main object of this invention.

Referring now to the drawing:

1 is the hand-hold, 2 the brace part, 3 the shank part, 4 is the fork-part of the shank, 5 a plunger sliding in a longitudinal bore 6 in the shank, which bore also provides space for coilspring 7, which presses against the end of the plunger.

The other end of the plunger is provided with a transverse plate 8, which presses against the lower part of socket 9, and said plate may have a straight upper surface as shown, or it may be slightly curved if so desired. Socket 9 is by means of pin 11.

The socket is pivotally mounted on block 10 by means of pin 12, so that the socket may be bent over in one direction by means of pin 12 (see Fig. 3) and. in a direction square thereto by means of pin 11 (see Fig. 5) and, by combination of the two motions, may be bent over in any other direction.

The spring '7 causes a yielding pressure of the plate 3 against the base of the socket 9 producing a cam like action between the plate and the socket of such character, that, when the wrench is not in use, the socket is forced into alignment with the shank, but, when operating on a nut at an angle to the shank, the action of the spring is not so strong as to hinder the socket from bending over or oscillating in any direction required, as

the shank is rotated.

I claim:

said universal joint including a block pivotally mounted between the tines of the fork on trunnions secured to the block and journaled to the tines of the fork, a pivot pin passing through the block transversely to and in the same plane as r the trunnions, a socket supported by the ends of said pivot pin, and a spring operated plate pressing yieldingly against the base of the socket to keep the socket in alignment with the shank when not operating at an angle to the shank.

2. The combination in a wrench of a shank having one end formed into a fork supporting a socket on a cardan joint, said cardan joint including a block pivotally mounted between the tines of the fork on trunnions secured in the block and journaled in the tines of the fork, a pivot pin passing through the block transversely to and in the same plane as the trunnions, a socket supported by the ends of said pivot pin, and a spring operated plate pressing yieldingly against the base of the socket to keep the socket in alignment with the shank when not operating at an OSCAR LUND. 

